refactor(errs): migrate from gperr.Error to standard Go error interface

This is a large-scale refactoring across the codebase that replaces the custom
`gperr.Error` type with Go's standard `error` interface. The changes include:

- Replacing `gperr.Error` return types with `error` in function signatures
- Using `errors.New()` and `fmt.Errorf()` instead of `gperr.New()` and `gperr.Errorf()`
- Using `%w` format verb for error wrapping instead of `.With()` method
- Replacing `gperr.Subject()` calls with `gperr.PrependSubject()`
- Converting error logging from `gperr.Log*()` functions to zerolog's `.Err().Msg()` pattern
- Update NewLogger to handle multiline error message
- Updating `goutils` submodule to latest commit

This refactoring aligns with Go idioms and removes the dependency on
custom error handling abstractions in favor of standard library patterns.

internal/serialization/validation.go

@@ -1,15 +1,15 @@
 package serialization
 
 import (
+	"errors"
 	"reflect"
 
 	"github.com/go-playground/validator/v10"
-	gperr "github.com/yusing/goutils/errs"
 )
 
 var validate = validator.New()
 
-var ErrValidationError = gperr.New("validation error")
+var ErrValidationError = errors.New("validation error")
 
 func Validator() *validator.Validate {
 	return validate
@@ -23,12 +23,12 @@ func MustRegisterValidation(tag string, fn validator.Func) {
 }
 
 type CustomValidator interface {
-	Validate() gperr.Error
+	Validate() error
 }
 
 var validatorType = reflect.TypeFor[CustomValidator]()
 
-func ValidateWithCustomValidator(v reflect.Value) gperr.Error {
+func ValidateWithCustomValidator(v reflect.Value) error {
 	vt := v.Type()
 	if v.Kind() == reflect.Pointer {
 		elemType := vt.Elem()